Digital Telephone Voice Recording Interfaces
Analogue Audio/Telephone Recording Interfaces
Covert Audio/Video Security System
Audio System / Dealer Board Interface Analogue Telephone Signalling Converters

Analogue to ISDN2 BRI Recording Interface (AD42). Analogue to ISDN2 Digital Converter (ADC). ACL developed the AD42 “Anti-DAC” card for situations where analogue signals (from conventional telephone lines or other speech sources) need to be transmitted over S0 (S-Bus) interfaces.

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2 independent analogue inputs with
adjustable gain.
Inputs can be connected directly to
analogue extension lines.
Optional phantom power for direct
connection of Electret microphone.
2 independent S/T interfaces, with
full NT/TE mode emulation.
Analogue inputs can go as B1 or
B2 to S/T1 and S/T2, or can be
configured for B1+B2 to S/T1 only.
Stable clock source for system

Universal interface for line cards
and recorders with ISDN S-bus.
Inputs to card are high impedance
differential with variable gain.
DC isolation and protection against
battery voltage and ringing current.
Full transformer isolation (>1kV
DC) from analogue and digital
inputs and outputs.
Fully compliant interface to S/T
point of S0 network.
Individual indication of NT and TE
sync. on each channel via LEDs.
A-law speech compression for
optimum voice-band quality.

Supplied as standard with 2 S/T
channels per card, B1 or B2 on
each, optionally B1+B2 to top
channel (S/T1) only;
Plugs into ACL universal digital
backplane housed in 3 U high
shelf, 15 cards (30 channels ). Or
supplied in 2 channel desk-top
enclosure with plug-top P.S.U.
Power +/-5 V DC
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